6815202811939 has 4 divisors (see below), whose sum is σ = 6815650224456. Its totient is φ = 6814755399424.

The previous prime is 6815202811919. The next prime is 6815202811957. The reversal of 6815202811939 is 9391182025186.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6815202811939 - 2⁹ = 6815202811427 is a prime.

It is a super-2 number, since 2×6815202811939² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6815202811939.

It is not an unprimeable number, because it can be changed into a prime (6815202811919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223683409 + ... + 223713874.

It is an arithmetic number, because the mean of its divisors is an integer number (1703912556114).

Almost surely, 2^{6815202811939} is an apocalyptic number.

6815202811939 is a deficient number, since it is larger than the sum of its proper divisors (447412517).

6815202811939 is a wasteful number, since it uses less digits than its factorization.

6815202811939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447412516.

The product of its (nonzero) digits is 1866240, while the sum is 55.

The spelling of 6815202811939 in words is "six trillion, eight hundred fifteen billion, two hundred two million, eight hundred eleven thousand, nine hundred thirty-nine".